DISPERSIVE ANTENNA FOR RFID TAGS
First Claim
1. A transponder, comprising:
- a rectifier;
a radio-frequency identification (RFID) circuit for receiving and responding to interrogation signals; and
a frequency dispersion element for receiving a multi-phase input signal and creating a pulse therefrom for input to the rectifier.
2 Assignments
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Accused Products
Abstract
RFID tag designs and sensors are disclosed that include a dispersive antenna and exhibit greater detection ranges relative to conventional designs. The designs include, for example a transponder having including a rectifier, a radio-frequency identification (RFID) circuit for receiving and responding to interrogation signals, and a frequency dispersion element for receiving a multi-phase input signal and creating a pulse therefrom for input to the rectifier. Frequency-dispersive elements (e.g., antennas) and compatible interrogation waveforms can be used so that the rectifying diodes receive high peak voltage levels relative to the average voltage levels.
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Citations
20 Claims
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1. A transponder, comprising:
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a rectifier; a radio-frequency identification (RFID) circuit for receiving and responding to interrogation signals; and a frequency dispersion element for receiving a multi-phase input signal and creating a pulse therefrom for input to the rectifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 20)
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17. A transponder, comprising:
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a rectifier; a radio-frequency identification (RFID) circuit for receiving and responding to interrogation signals; a hysteretic switch coupled between the rectifier and the RFID circuit; and a frequency dispersion element for receiving a multi-phase input signal and creating a pulse therefrom for input to the rectifier; wherein the rectifier operates to convert RF energy of the pulse to DC voltage, multiply that DC voltage, and store the resulting voltage. - View Dependent Claims (18)
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19. A transponder, comprising:
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a rectifier; a radio-frequency identification (RFID) circuit for receiving and responding to interrogation signals; a hysteretic switch coupled between the rectifier and the RFID circuit; and a frequency dispersion element for receiving a multi-phase input signal and creating a pulse therefrom for input to the rectifier, wherein the frequency dispersion element comprises at least one of an antenna, a surface acoustic wave (SAW) correlator, and a dispersive delay line.
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Specification